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那天下午我在某間住家附近的咖啡廳進行程式架構設計，突然覺得為什麼咖啡廳會那麼吵雜呢?
觀望一下四周，發現原因大概要分成兩個，首先是大家開心的跟友人聊天時，很容易不自覺就忘記注意自身音量，而氣氛歡騰的時候對方或是第三者也很難提醒，其次是惡性循環，當某一桌開始很大聲，其他桌就容易聽不清楚，就會也不自覺變大聲，最終就導致整個咖啡廳變得很吵雜
所以我抽出一張新的白紙，想著能不能有甚麼方式，可以在某桌客人聊天音量增大時，友善的提醒，於是就畫了分貝貓貓的設計稿
"噓，我們吵到貓貓了"
後來去書局買了必要的材料，然後又買了一隻貓布偶，分貝貓貓就誕生了
但幾次和親友吃飯都帶分貝貓貓去實驗後，發現有兩個問題，其一是環境差異太大，有些環境雖然有音量但可能因為開闊不會覺得很吵，但是分貝貓貓可能太敏感就會一直跑出來，甚至該桌成員都沒有說話的情況
其次我主要架構使用Arduiono 加上 伺服馬達，但那時候透過Arduino供電的馬達力量很不足，以致貓貓常常出不來，或是出來了就回不去
決定開始升級分貝貓貓，首先我幫分貝貓貓加上LCD面板和搖桿，讓分貝貓貓變成可以根據現場情況調整敏感度
並且再幫分貝貓貓的伺服馬達加上外接的電池盒，分貝貓貓出來和回去的穩定性頓時提升到非常理想的狀態
"嘿! 我會，一直，一直，一直盯著你們"
目前是有個有興趣的學弟正在嘗試能不能用體積更小，又更雅致的設計，實現同樣的概念
Evolver系列研究一直在研究是否能使用ML，來自動生成可以和使用者互動的物理性物件
出發點有二，其一是XR(AR/VR/MR)未來的UX傾向一定是使用肢體或手勢來控制，也就是說很容易不是鍵盤之類可預測的固定輸入，而是會產生不可預測的手勢軌跡等
所以以遊戲為例，以往遊戲開發很容易使用固定的人物招式動畫，配上固定的物理結果，例如按下"S"鍵，遊戲角色會揮出右拳，擊退對手1公尺，精緻的遊戲根據打的部位或時機不同，對手的反應動畫可能會不同，但最終也在有限的範圍內，因此不論多精緻的遊戲幾乎玩久都會膩
然而XR遊戲可能是讓使用者自己揮拳，如果揮很小力或很大力，打的部位或軌跡不同，對手卻不能自然的反應承受的物理現象，會是很大的實作缺憾
其二就是承上述，隨著使用者的輸入介面改變，輸入組合與變化急遽增加，如果用傳統的方式製作和玩家互動的動畫，遊戲開發的時間和成本應該都會劇烈提高，並且AI理論上難以實作，因為如果是寫死的程式，很容易被玩家找出固定模式就流於單調或套招
因此Evolver研究就是希望製作純物理性的角色，也就是不是靠動畫師去細膩的模擬被碰撞或打擊的動作，而是角色本身就有自然的物理屬性，這個技術行之有年，物理性人物在Unity被稱為Ragdoll
但下一階段是現行尚不成熟的領域，"讓物理性角色自行動起來"，這個實作難度很高，以人體來說光是雙足平衡的站立就是奇蹟般的技巧，想用程式寫出能操作物理性肢體的人物是極端困難，原本主流形式是虛擬人物一般是動畫人物，直到被玩家打擊或擊飛才切換成物理性人物
但這樣在XR互動就是不夠浪漫，例如如果一個虛擬角色攻擊你，你無法根據你和虛擬角色互相的出力，呈現自然的反應，就用Wii的拳擊遊戲為例，相信很多人都發現只要出拳就好，不管力道，敵人被打後仰程度都相同，更不會出現卡住對方或力量抵消的情況
因此為了實現能理想使用在XR的人物，並且期待降低未來遊戲或XR開發者的工作量，當知曉ML技術後就開始自行嘗試這個研發計畫
"Evolver紅蓮: 使用ML讓物理性人物能自行學會指定互動"
現階段各種紅蓮研究仍然在進行中，不過近期幾次想把研究複雜度提升上去，例如虛擬人物對打，都一直遭遇硬體限制，也就是我目前能用來訓練ML的電腦效能不夠，嗚嗚
目前暫時都回歸進行一些細部研究，例如腳踝可動性對ML成果的差異，或是如何引導靜止站立等等，希望2021也能訓練出有趣的新成果來和大家分享
暑假和朋友組團去參加XR開發者競賽發想的題目，主要構想是讓捷運車廂變成VR的載體，車廂窗戶會投放不同程式或是異國風光，讓乘客搭著捷運的時候就宛如在世界各地旅行
那時候為了拍概念影片，畫了一張分鏡稿
然後最終概念影片成品
這個構想雖然評審說很喜歡，但最後沒有得獎，可能實務方面太困難了，但對我來說最大收穫是發現了一個剪片很厲害的學妹，多虧她後來另一側的行銷影片才能循環出產
| LOGIN PERMISSIONS |
|---|
using UnityEngine;
using System.Collections;
public class MainPlayer : MonoBehaviour {
public string myName;
// Use this for initialization
void Start () {
Debug.Log("I am alive and my name is " + myName);
}
// Update is called once per frame
void Update () {
}
}
#pragma strict
var myName: String ;
function Start () {
Debug.Log("I am alive and my name is " + myName);
}function Update () {}function Update () { transform.Translate(Vector3(0, 0, 1) * Time.deltaTime);}
| OnTriggerEnter | OnTriggerEnter is called when the Collider other enters the trigger. |
| OnTriggerExit | OnTriggerExit is called when the Collider other has stopped touching the trigger. |
| OnTriggerStay | OnTriggerStay is called almost all the frames for every Collider other that is touching the trigger. |
| OnCollisionEnter | OnCollisionEnter is called when this collider/rigidbody has begun touching another rigidbody/collider. |
| OnCollisionExit | OnCollisionExit is called when this collider/rigidbody has stopped touching another rigidbody/collider. |
| OnCollisionStay | OnCollisionStay is called once per frame for every collider/rigidbody that is touching rigidbody/collider. |
| Collision detection occurs and messages are sent upon collision | ||||||
|---|---|---|---|---|---|---|
| Static Collider | Rigidbody Collider | Kinematic Rigidbody Collider | Static Trigger Collider | Rigidbody Trigger Collider | Kinematic Rigidbody Trigger Collider | |
| Static Collider | Y | |||||
| Rigidbody Collider | Y | Y | Y | |||
| Kinematic Rigidbody Collider | Y | |||||
| Static Trigger Collider | ||||||
| Rigidbody Trigger Collider | ||||||
| Kinematic Rigidbody Trigger Collider | ||||||
| Trigger messages are sent upon collision | ||||||
|---|---|---|---|---|---|---|
| Static Collider | Rigidbody Collider | Kinematic Rigidbody Collider | Static Trigger Collider | Rigidbody Trigger Collider | Kinematic Rigidbody Trigger Collider | |
| Static Collider | Y | Y | ||||
| Rigidbody Collider | Y | Y | Y | |||
| Kinematic Rigidbody Collider | Y | Y | Y | |||
| Static Trigger Collider | Y | Y | Y | Y | ||
| Rigidbody Trigger Collider | Y | Y | Y | Y | Y | Y |
| Kinematic Rigidbody Trigger Collider | Y | Y | Y | Y | Y | Y |
| Property: | Function: |
|---|---|
| Mass | The mass of the object (arbitrary units). You should not make masses more or less than 100 times that of other Rigidbodies. |
| Drag | How much air resistance affects the object when moving from forces. 0 means no air resistance, and infinity makes the object stop moving immediately. |
| Angular Drag | How much air resistance affects the object when rotating from torque. 0 means no air resistance. Note that you cannot make the object stop rotating just by setting its Angular Drag to infinity. |
| Use Gravity | If enabled, the object is affected by gravity. |
| Is Kinematic | If enabled, the object will not be driven by the physics engine, and can only be manipulated by its Transform. This is useful for moving platforms or if you want to animate a Rigidbody that has a HingeJoint attached. |
| Interpolate | Try one of the options only if you are seeing jerkiness in your Rigidbody’s movement. |
| None | No Interpolation is applied. |
| Interpolate | Transform is smoothed based on the Transform of the previous frame. |
| Extrapolate | Transform is smoothed based on the estimated Transform of the next frame. |
| Collision Detection | Used to prevent fast moving objects from passing through other objects without detecting collisions. |
| Discrete | Use Discreet collision detection against all other colliders in the scene. Other colliders will use Discreet collision detection when testing for collision against it. Used for normal collisions (This is the default value). |
| Continuous | Use Discrete collision detection against dynamic colliders (with a rigidbody) and continuous collision detection against static MeshColliders (without a rigidbody). Rigidbodies set to Continuous Dynamic will use continuous collision detection when testing for collision against this rigidbody. Other rigidbodies will use Discreet Collision detection. Used for objects which the Continuous Dynamic detection needs to collide with. (This has a big impact on physics performance, leave it set to Discrete, if you don’t have issues with collisions of fast objects) |
| Continuous Dynamic | Use continuous collision detection against objects set to Continuous and Continuous Dynamic Collision. It will also use continuous collision detection against static MeshColliders (without a rigidbody). For all other colliders it uses discreet collision detection. Used for fast moving objects. |
| Constraints | Restrictions on the Rigidbody’s motion:- |
| Freeze Position | Stops the Rigidbody moving in the world X, Y and Z axes selectively. |
| Freeze Rotation | Stops the Rigidbody rotating around the world X, Y and Z axes selectively. |